Walls of Tarraco, at Tarragona.
An outstanding building because ot its facture and its state of preservation among those remaining from Republican age.
This wall was built betweem 3rd and 2nd centuries b.C. The most original from them is mixture of Iberian and Roman constructive elements and use of different techniques used at each phase. Today, more than 1.300 m. are kept in a good state.
First phase -3rd century b.C.-, shows big ashlars roughly carved -some cyclopean ashlars are more than 4 x 1m.-, as a plinth; 6m. high and 4,5m. wide. It is composed by two walls made of these big ashlars filled with rubbish and stones.
At a second phase, at 2nd century b.C., its perimeter was made wider and higher. Lesser ashlars, some of them slightly padded and well carved, "opus quadratum" were supported on a megalithic base being up to 11 m. high. It is composed, as at prior phase, by two parallel walls with a separation of 4,5 m. filled with masonry, fit adobes, stones and lime, with transversal braces of 10 m. long each one. Access to the upper section of the walls was made through several slopes. Remainings of three are kept. At the sides ot the walls there were doors and six little lintel accesses. Sometimes there are defensive towers at the most delicate points: tower of Minerva, of Cabiscoland of Archbishop. These towers have been lately modified, specially Archbishop one.
Later, this wall was amplified, without towers. It conditioned evolution of urbanism, marking an improvement.
Walls were used and restored at several ages, being partially spoilt as their ashlars were used as quarries for other constructions.